/**
 * Bitennial Admin - Loading Screen
 * Logo fijo en el centro con spinner circular giratorio con efecto de "trailing fade"
 */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(255, 255, 255, 0.98);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    text-align: center;
}

/* Contenedor del logo - FIJO, sin animación */
.loading-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 30px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-logo img {
    width: 100%;
    height: 100%;
    display: block;
    position: relative;
    z-index: 2;
}

/* Spinner circular con efecto de "trailing fade" */
.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 120px;
    margin: -60px 0 0 -60px;
    z-index: 1;
}

/*
 * Approach 1: Conic gradient con mask para el efecto de trailing fade
 * El gradiente cónico crea el efecto de "residuo que desaparece"
 */
.loading-spinner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(
        from 0deg,
        transparent 0%,
        transparent 10%,
        rgba(0, 123, 255, 0.1) 20%,
        rgba(0, 123, 255, 0.3) 40%,
        rgba(0, 123, 255, 0.6) 60%,
        rgba(0, 123, 255, 0.9) 80%,
        #007bff 90%,
        #007bff 100%
    );
    mask: radial-gradient(
        circle,
        transparent 0%,
        transparent 70%,
        black 70%,
        black 85%,
        transparent 85%,
        transparent 100%
    );
    -webkit-mask: radial-gradient(
        circle,
        transparent 0%,
        transparent 70%,
        black 70%,
        black 85%,
        transparent 85%,
        transparent 100%
    );
    animation: spin 1.2s linear infinite;
}

/*
 * Approach 2 (backup/alternative): Dots con staggered animation
 * Si el conic-gradient no se ve bien en algún browser
 */
.loading-dots {
    display: none; /* Oculto por defecto, activar si se prefiere este estilo */
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 120px;
    margin: -60px 0 0 -60px;
}

.loading-dots span {
    position: absolute;
    width: 8px;
    height: 8px;
    background: #007bff;
    border-radius: 50%;
    opacity: 0.2;
    animation: dotPulse 1.2s ease-in-out infinite;
}

/* Posicionamiento de los 12 dots en círculo */
.loading-dots span:nth-child(1)  { transform: rotate(0deg) translateY(-56px); animation-delay: 0s; }
.loading-dots span:nth-child(2)  { transform: rotate(30deg) translateY(-56px); animation-delay: -0.1s; }
.loading-dots span:nth-child(3)  { transform: rotate(60deg) translateY(-56px); animation-delay: -0.2s; }
.loading-dots span:nth-child(4)  { transform: rotate(90deg) translateY(-56px); animation-delay: -0.3s; }
.loading-dots span:nth-child(5)  { transform: rotate(120deg) translateY(-56px); animation-delay: -0.4s; }
.loading-dots span:nth-child(6)  { transform: rotate(150deg) translateY(-56px); animation-delay: -0.5s; }
.loading-dots span:nth-child(7)  { transform: rotate(180deg) translateY(-56px); animation-delay: -0.6s; }
.loading-dots span:nth-child(8)  { transform: rotate(210deg) translateY(-56px); animation-delay: -0.7s; }
.loading-dots span:nth-child(9)  { transform: rotate(240deg) translateY(-56px); animation-delay: -0.8s; }
.loading-dots span:nth-child(10) { transform: rotate(270deg) translateY(-56px); animation-delay: -0.9s; }
.loading-dots span:nth-child(11) { transform: rotate(300deg) translateY(-56px); animation-delay: -1.0s; }
.loading-dots span:nth-child(12) { transform: rotate(330deg) translateY(-56px); animation-delay: -1.1s; }

/* Texto de loading */
.loading-text {
    color: #333;
    font-size: 18px;
    font-weight: 500;
    margin-top: 20px;
    animation: pulse 1.5s ease-in-out infinite;
}

.loading-subtext {
    color: #6c757d;
    font-size: 14px;
    margin-top: 8px;
}

/* Animación de rotación para el spinner */
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Animación de pulso para los dots (approach alternativo) */
@keyframes dotPulse {
    0%, 100% {
        opacity: 0.2;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

/* Animación de pulso para el texto */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

/* Animación de entrada suave del contenido */
@keyframes fadeInScale {
    0% {
        opacity: 0;
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.loading-content {
    animation: fadeInScale 0.4s ease-out;
}

/* Spinner adicional para el botón de login */
.btn-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid #ffffff;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Responsive: ajustar tamaño en mobile */
@media (max-width: 480px) {
    .loading-logo {
        width: 60px;
        height: 60px;
    }

    .loading-spinner {
        width: 100px;
        height: 100px;
        margin: -50px 0 0 -50px;
    }

    .loading-text {
        font-size: 16px;
    }
}